Specifications

°
7
2mm BTDC
B position
TDC
2mm ATDC
C position
Stage 1
Set disc position roughly
" 0° "
Stage 2
Measurement at 2mm before and
after Top Dead Center
22° 24°
Stage 3
1st adjustement of the disc
22,5° 23,5°
Stage 4
2nd adjustment of the disc
23°
0°
23°
The angle indicated above are an example. You may measure different values
Angle in
Degree on the
disc
Piston position
Symmetrical degree on each side of the disc =>
the disc correctly indicate TDC at “ 0° ”
You must go through this steps has there is a wide angle (about 2 to 3 degrees)
when the piston does not move. You will repeat the stages in order to get the same
angle on the disc when the piston is 2mm symmetrically before and after the Top
Dead Center.
On the sample, in stage 4, the disc is in a correct position. This is the starting point
for the measurement of the camshaft event angle.